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A previously unheard home studio cassette recording of Prince performing at his piano in 1983 will be released as Piano & A Microphone on Sept. 21. The nine-track, 35-minute project from the Prince Estate in coordination with Warner Bros. Records is planned for what would have been the rock icon's 60th birthday.

This rare, intimate glimpse finds Prince working through songs including "17 Days" and "Purple Rain" (which would both be released the following year), a cover of Joni Mitchell's "A Case of You," "Strange Relationship" (issued in 1987 on the Sign O' The Times album) and "International Lover," as well as a rare recording of the pre-Civil War spiritual "Mary Don't You Weep," which will be heard on the end credits of Spike Lee's upcoming film BlacKkKlansman, due out in August.